"A Randomized Trial of Planned Cesarean or Vaginal Delivery for Twin Pregnancy"
NEJM Oct 9
http://www.nejm.org/doi/full/10.1056/NEJMoa1214939?query=featured_home 
"CONCLUSIONS

In twin pregnancy between 32 weeks 0 days and 38 weeks 6 days of gestation, with the first twin in the cephalic presentation, planned cesarean delivery did not significantly decrease or increase the risk of fetal or neonatal death or serious neonatal morbidity, as compared with planned vaginal delivery."